Japanese Tunnel, Lamma (North of Youth Camp) [????- ]

Nothing very exciting, just a short tunnel that runs straight back into the hillside.

If you're looking on the Countryside Series map, you'll see a small hill marked with '135' height, just to the north of the youth camp. This tunnel is on the south west slope of that hill, just above the footpath that is marked with the solid line (you can also see the path in the satellite view above).

The entrance is where you can see the tree in the middle of this photo:

And here's a closer view